Unmanned Systems Technology XIX Karlsen, Robert E. ; Gage, Douglas W. ; Shoemaker, Charles M. ; Nguyen, Hoa G. Abstract Publication: Society of Photo-Optical Instrumentation Engineers (SPIE) Conference Series Pub Date: May 2017 DOI: 10.1117/12.2281256 Bibcode: 2017SPIE10195E....K